package com.beijing.Thread_state;

/**
 * @Author Ma Wenqi
 * @Date 2021/3/27 16:23
 * @Version 1.0
 */
//Java提供一个线程调度器来监控程序中启动后进入就绪状态的所有线程，线程调度器按照优先级来决定应该调度哪个线程来执行。
//
//线程的优先级用数字表示，范围从1~10.
//
//Thread.MIN_PRIORITY = 1;
//Thread.MAX_PRIORITY = 10;
//Thread.NORM_PRIORITY = 5;
//使用一下方法改变或获取优先级
//​ getPriority.setPriority(int xxx)
public class TestPriority {
    public static void main(String[] args) {
        //主线程  默认优先级@@@@@@ 5
        System.out.println(Thread.currentThread().getName()+"-->"+Thread.currentThread().getPriority());

        MyPriority myPriority = new MyPriority();

        Thread t1 = new Thread(myPriority);
        Thread t2 = new Thread(myPriority);
        Thread t3 = new Thread(myPriority);
        Thread t4 = new Thread(myPriority);
        Thread t5 = new Thread(myPriority);
        Thread t6 = new Thread(myPriority);

        //先设置优先级，再启动@@@@@
        //优先级低知识意味着获得调度的概率低，并不是优先级低就不会被调用了，这都是看CPU的调度
        t1.start();

        t2.setPriority(1);
        t2.start();

        t3.setPriority(4);
        t3.start();

        t4.setPriority(Thread.MAX_PRIORITY); // MAX_PRIORITY=10
        t4.start();

//        t5.setPriority(-1);   //Exception in thread "main" java.lang.IllegalArgumentException
//        t5.start();
//
//        t6.setPriority(11);   //Exception in thread "main" java.lang.IllegalArgumentException
//        t6.start();

    }

}

class MyPriority implements  Runnable{

    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName()+"-->"+Thread.currentThread().getPriority());
    }
}